Help with the second GEN modification?

I have a stock 2013 double cab long bed SR5 that I use for easy 4 wheeling and overlanding type trips. On a recent trip with my family the truck was loaded with a weeks worth of water food and camping gear and it seem to be squatting really badly in the rear. I also found that I was dragging the receiver hitch in the dirt when exiting steep washes. I've been thinking of adding a lift to overcome the long wheelbase to some degree but I'm wondering is there are any suggestions regarding how much lift and also if anything should be done to stiffen up the rear when I haul these types of loads.
The attached picture was at the end of the trip when it was relatively light and unloaded.

 

Expedition pack

 

Try an Old Man Emu lift with a set of Dakar leafs in the rear. Pretty easy install too. My before and after is below: